On the Giant Pheretimoid Earthworms From Vietnam (Clitellata: Megascolecidae), with Descriptions of Three New Species.

The giant earthworms from Vietnam are being reviewed to consist of six species, (Thai, 1984), (Thai & Tran, 1986) comb. nov., (Thai, 1982), and three new, sp. nov., sp. nov. and sp. nov. All six species have lengths ranging 300-680 mm, diameter ca. 16-20 mm, and without copulatory pouches. The new species, sp. nov. is characterised by three pairs of spermathecal pores in intersegment 5/6/7/8, genital markings paired in vii, viii and xviii. sp. nov. is distinguished by four pairs of spermathecal pores in 5/6/7/8/9, genital marking paired in viii, ix, and xviii. sp. nov. is recognised by four pairs of spermathecal pores in 5/6/7/8/9, genital marking single in viii, paired in xviii. In addition, a key to all six gigantic species in Vietnam is also provided.